linux-kernel - Re: [PATCH v11 2/3] rust: add dma coherent allocator abstraction.

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Message-Id: <633274AD-E55C-4A90-AB72-33D3E176176F@collabora.com>
Date: Sat, 15 Feb 2025 18:40:37 -0300
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Abdiel Janulgue <abdiel.janulgue@...il.com>
Cc: rust-for-linux@...r.kernel.org,
 dakr@...nel.org,
 robin.murphy@....com,
 aliceryhl@...gle.com,
 Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>,
 Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <benno.lossin@...ton.me>,
 Andreas Hindborg <a.hindborg@...nel.org>,
 Trevor Gross <tmgross@...ch.edu>,
 Valentin Obst <kernel@...entinobst.de>,
 open list <linux-kernel@...r.kernel.org>,
 Christoph Hellwig <hch@....de>,
 Marek Szyprowski <m.szyprowski@...sung.com>,
 airlied@...hat.com,
 "open list:DMA MAPPING HELPERS" <iommu@...ts.linux.dev>
Subject: Re: [PATCH v11 2/3] rust: add dma coherent allocator abstraction.

Hi Abdiel

I noticed that there’s no API to call `dma_set_mask/dma_set_coherent_mask`.

This should probably be included, i.e.:

```
By default, the kernel assumes that your device can address 32-bits of DMA addressing.
For a 64-bit capable device, this needs to be increased, and for a device with limitations,
it needs to be decreased.
```

— Daniel